Material Characterization of the Pavement Structure Using FWDT, a Non-Destructive Testing Technique

使用 FWDT（一种无损检测技术）对路面结构进行材料表征

• 批准号: 521663-2017
• 负责人: Maghoul, Pooneh
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640552
• 关键词: Material; Characterization; Pavement; Structure; Using

Pavement structures reach performance limits when there are multiple deteriorations caused by repeatedvehicle loading and environmental effects. Therefore acquiring detailed information about the state of thepavement structures is an important element in rehabilitation planning of sections showing significant damage.Non-Destructive-Testing (NDT) Methods have been broadly used for structural health monitoring and low-costassessment in transportation. Falling Weight Deflectometer (FWD) is one of the most popular NDT techniquesin characterisation of the mechanical properties of the pavement structure. The FWD test measures the surfacedeflections caused by dropping a known mass from a specific height. The presence of moisture in the pavementstructure can significantly affect the performance of the pavement. Another important issue to the pavementmaintenance is the seasonal factor in cold regions. The mechanical properties of the layers constituting themultilayered flexible pavement system can be determined by using a back-calculation algorithm based onacquired surface displacement data. The current practical state-of-the-art of this method is limited to thequasi-static inversion of the maximum measured deflections. However, this approach does not take advantageof the additional information contained in the stress wave time histories such as damping, moisture content,and the effect of porous structure. The accuracy of determining the mechanical properties of the layers wouldalso improve by using a comprehensive dynamic analysis rather than a quasi-static analysis. The objective ofthe proposed research is to develop an algorithm for the material characterization of the pavement structurethrough a least square-based inversion technique.FPrimeC Solutions specializes in the design and development of innovative Non-Destructive Testingequipment and Structural Health Monitoring Systems for testing materials and structures. FPrimeC is interestedin developing an innovative algorithm to achieve more accurate and more reliable information using FWD toevaluate the material properties of the pavement structure.

路面结构达到性能极限时，有多个恶化所造成的反复车辆荷载和环境影响。因此，获取路面结构状态的详细信息是修复计划中的一个重要组成部分，显示出显着的损坏.非破坏性测试（NDT）方法已被广泛用于结构健康监测和低成本评估在交通.落锤式弯沉仪（FWD）是表征路面结构力学性能最常用的无损检测技术之一。FWD测试测量从特定高度落下已知质量引起的表面偏转。路面结构中水分的存在会显著影响路面的性能。寒冷地区路面养护的另一个重要问题是季节因素。基于采集到的路面位移数据，采用反算算法，可以确定多层柔性路面系统各层的力学特性。这种方法目前的实用水平仅限于准静态反演最大实测挠度。然而，这种方法没有考虑包含在应力波时程中的附加信息，如阻尼、含水量和多孔结构的影响。采用综合动态分析而不是准静态分析，也可以提高确定层的力学性能的准确性。该研究的目的是通过基于最小二乘法的反演技术开发一种用于路面结构材料表征的算法。FPrimeC Solutions专门设计和开发用于测试材料和结构的创新无损检测设备和结构健康监测系统。FPrimeC致力于开发一种创新的算法，利用FWD评估路面结构的材料特性，以获得更准确、更可靠的信息。